Word 2010, at least, uses ODT 1.1. Word 2013 is unlikely to differ, but you can check the version # in the ODT file itself. Simply convert the file extension to .zip, open the Zip archive and expand the settings.xml archive. At the end of that file's 'office:document-settings' block you'll find a reference to the ODT version, formatted like:
office:version="1.1"
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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